Faba Bean Protein Extraction via Alkaline-Acidic pH Shift
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Solution Overview
Problem
The challenges in producing high-quality pulse protein isolates from plant sources, such as faba beans, include the complexity and cost of extraction processes, which often result in denatured proteins and significant environmental impact, particularly due to the use of isoelectric precipitation methods that require expensive reagents and energy-intensive steps.
Innovation Solution
A method involving coarsely grinding pulse seeds, hydrating them before milling into flour, and then separating and purifying the proteins, which bypasses the need for isoelectric precipitation, thereby preserving the native character of the proteins and reducing environmental and economic burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If isoelectric precipitation methods are used to extract pulse proteins, then protein purity is improved, but manufacturing cost and environmental impact worsen due to expensive reagents and energy-intensive steps
Solution Approach 1:
The patent extracts only the necessary step (alkaline extraction followed by acidification) while removing the expensive and energy-intensive isoelectric precipitation step. The proteins are extracted using alkaline solution and then precipitated by simple acidification to pH 3-4, achieving high purity without the complex precipitation procedures of prior art
Solution Approach 2:
The patent changes the pH parameter dynamically during the process: first adjusting to alkaline pH (8-10) for extraction, then adjusting to acidic pH (3-4) for precipitation. This parameter change approach replaces the need for expensive reagents and energy-intensive steps while maintaining high protein purity
2Manufacturing precision
If isoelectric precipitation methods are used to extract pulse proteins, then protein purity is improved, but energy consumption worsens due to energy-intensive steps
Solution Approach 1:
The patent removes the energy-intensive isoelectric precipitation step from the process, retaining only the essential alkaline extraction and simple acidification steps. This dramatically reduces energy consumption while maintaining high protein purity through selective solubility changes at different pH levels
Solution Approach 2:
The patent uses pH parameter changes (alkaline to acidic) to control protein solubility and achieve precipitation without energy-intensive equipment or processes. The proteins naturally precipitate when pH is adjusted to their isoelectric point, eliminating the need for external energy input for separation
3Productivity
If conventional extraction processes are used, then protein isolation is achieved, but protein denaturation worsens
Solution Approach 1:
The patent performs preliminary alkaline extraction that selectively solubilizes proteins while leaving other components intact. This preliminary separation step allows subsequent gentle acidification to precipitate pure proteins without exposing them to harsh conditions that would cause denaturation
Solution Approach 2:
The patent uses controlled pH parameter changes within a relatively narrow and gentle range (alkaline pH 8-10 to acidic pH 3-4) to achieve protein precipitation. This controlled parameter change maintains protein native structure while effectively isolating the protein from other seed components
4Manufacturing precision
If multiple costly and time-consuming manipulations are used to obtain high-quality protein isolate, then protein purity is improved, but processing time worsens
Solution Approach 1:
The patent removes multiple intermediate purification steps from the conventional process, retaining only the essential alkaline extraction and acidification steps. This streamlining achieves high protein purity in fewer operations, significantly reducing processing time while maintaining effectiveness
Solution Approach 2:
The patent combines multiple functions into a single integrated process: alkaline extraction simultaneously solubilizes proteins and separates them from insoluble components, and subsequent acidification both precipitates proteins and concentrates them. This multi-functional approach replaces multiple separate操作步骤 with a unified process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves a high protein yield with comparable purity to isoelectric precipitation methods while minimizing water and energy consumption, and reduces the sodium content and costs associated with reagent usage, resulting in a more economical and environmentally friendly process.
Implementation Method 1
hydrating these coarsely ground pulse seeds
Data Source
AI summary
The present invention relates to a pulse protein composition, preferably faba bean protein composition that has a protein content of at least 60 wt % by weight based on dry matter, a nitrogen solubility index at pH ranging from 4.5 to 5.5 of at least 20%, preferably of at least 15% and at pH of 3.5 of at least 20%, preferably of at least 40%, as measured on a aqueous composition comprising 3 wt % of said pulse protein composition based on the total weight of the aqueous composition and optionally a viscosity of at most 2000 cP at pH 6.5. The invention further relates to methods for extracting pulse proteins, preferably faba bean protein. The invention further relates to pulse protein composition obtainable by the above methods, as well as food or feed products containing such pulse protein composition. The invention also relates to the use of such pulse protein composition in food or feed industry.